Another CBR750 and Comcast/Xfiniity ISP Service Issue

Aspirant

Jun 08, 2023

So I had an Xfinity technician out at my place on Sunday - he did find one unused customer cable from a neighboring property was causing distortion so he capped that off. He feels that may be the reason for the correctibles on some of the channels. For other Xfinity clients viewing this I had to go through their "Update Plan" wizard to re-configure the speed of my connection to 800Mb/s. What he told me is that I was on an older plan (I selected this plan 18 months ago when I moved into this house) so I had to "upgrade" my plan to their latest plan definition even though I was actually seeking to ensure that I was configured for 800 Mb/s and nothing higher. This ended up costing me around $10/month more for exactly the same services I had on my existing plan...

I'm travelling out of town this week, so haven't been able to confirm whether all of these changes have resulted in stability. My wife did experience an outage on Tuesday and I had to talk her through rebooting the router. I can't tell right now if it was the same issue or something different as I can't see the logs. I will keep monitoring for the next week or so, as the speed slowdown and the need to reboot usually presents itself between every two or three days.

The Xfinity technician did share that they recently introduced what he called mid-split on the network to improve the speed upstream speeds. My modem only syncs to 4 upstream channels. He said he would follow up internally about the status between Xfinity and Netgear to ensure that they have a valid boot file supporting these additional channels on the network. This is an interim step towards DOCSIS 4 roll-out, which be able to provide symmetrical download and upload speeds via cable, similar to fiber.

angeloh
Aspirant
Jun 13, 2023
An update - the problem still persists. I've had two instances where my speed has slowed down and I've had to reboot my router in the past week. It doesn't appear that any of these configuration changes have resolved the issue. I guess Xfinity and Netgear need to align on an updated boot file to ensure that the modem syncs correctly with the new channels added by Xfinitiy. I don't have any visibility into the progress between Xfinity and Netgear, if they are even working on a solution to this problem.

I would be curious to know if this problem is regional. I am in Colorado (Colorado Springs) and would love to know if any other Xfinity users are successfully using a CBR750 without such issues in Colorado.
- FURRYe38
  Guru - Experienced User
  Jun 17, 2023
  Id keep on the ISP.
  
  I know that others that have the CBR750 have it working on CC/XF services, however they are not in CO. I think one is back east and other is in CA.
- quciet
  Aspirant
  Jun 20, 2023
  Hi there, do you have any updates?
  
  I recently moved to Parker, Colorado, and had to switch from Centurylink to Xfinity. I bought the same set (CBK753) and am now facing the exact same issue. I was reading a thread from Xfinity's forum and that person said he had to get a standalone modem in the end, and then connect it to a mesh system. I might have to do the same (return the current set and get a new modem and separated mesh wifi) since Netgear's return policy is 30 days.
  - angeloh
    Aspirant
    Jun 20, 2023
    Hi,
    
    Unfortunately I don't have a resolution for my issue. If you are still within the return window I would recommend going with a separate modem and mesh system. In retrospect, I should have done the same. You can switch out just the modem if you want to upgrade for example, to DOCSIS 4 once this is rolled out by ISPs, without having to replace your entire mesh system. If you can afford it, make sure you buy a mesh system with 10 Gb/s LAN ports and not only 1 Gb/s which is what the CBR750 has.
    
    I generally like Netgear's products and Orbi is recognized as a good mesh system, but their support is totally disappointing for me. This entire issue has been one of the ISP blaming Netgear and Netgear blaming the ISP. I've paid over $600 for a solution that I need to reboot every 2 days. To be fair, the issue seemed to arise when Xfinity introduced some changes to their network - I was running stable for over a year initially but since these network updates I have had only instability. The Xfinity tech who came out to my premises indicated that this network change was implemented to increase the upload speed in relation to the download speed. The boot file (I don't understand whether this is Xfinity's responsibility or Netgear's or shared) doesn't seem to be aware of these additional channels and the modem doesn't sync fully.
    
    Regards,
    
    Angelo

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Another CBR750 and Comcast/Xfiniity ISP Service Issue